prop

source/src/popup/HelloWorld.vue

@@ -9,11 +9,10 @@ import {Component, Prop, Vue} from "vue-property-decorator";
 
 @Component
 export default class HelloWorld extends Vue {
-  @Prop()
-  msg = ''
+  @Prop({default: ""})
+  msg: string | undefined;
 
   created() {
-    debugger
     console.log(this.msg)
   }
 }